It's a fair point given that "Original Cast Recording" is not an artist. Personally, for soundtracks or cast recordings, I'd use the singer as the artist, or if it's an instrumental, the composer or producer. Simple. There's always at least one human being that you can name.

But... I've downloaded things from iTunes (my live Rocky Horror recording, for instance) that uses Original Cast Recording as its artist. Many of the CDs I own put Original Cast Recording or a variation thereof (Broadway or London) by default.
Sorry, Last.fm, but I have no interest in clogging the hell out of my iTunes and media library just because you say my artist tags are 'wrong'.

"Last.fm needs to fix scrobbling with Broadway shows. There is no unified way to tag these songs other than by show. If you tag by whatever combination of performers happen to be in each song, you'll have 10-15 different artist combos for each soundtrack. That just adds more clutter to the site."
I agree with this.

Uhhh...you can't get mad at people for having incorrect tags and then not explain how you want us to fix them. Use the "artist" - what does that mean for a cast recording? Who is the artist? The person who wrote the song? The singer of that particular song? The conductor of the orchestra?

What bullshit. The name of the musical is the Album, the person who wrote it is the Composer, and the cast that recorded it is the Artist. That's it. There's no other way to do it. I can't even imagine what last.fm wants us to use...